Information Retrieval Questions
The normalized discounted cumulative gain (NDCG) is a metric used to evaluate the effectiveness of a ranking algorithm in information retrieval. It measures the quality of the ranked list of documents by considering both the relevance of the documents and their positions in the list. NDCG takes into account the graded relevance of each document, discounting the relevance based on its position in the list. It is normalized to a value between 0 and 1, where 1 represents the ideal ranking with all relevant documents at the top.